Tread portion of an automobile tire



FIG. 1 is a perspective view of a tread portion of an automobile tire;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a plane view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a fragmentary enlarged view showing the details of the tread portion thereof; and,

FIG. 7 is an end view taken along line 7-7 in FIG. 6 thereof.

In the drawings, the broken lines defining portions of the tread, the sidewall, inner bead depict environmental subject matter that forms no part of the claimed design. 

The ornamental design for a tread portion of an automobile tire, as shown and described. 